我找到了解决办法。您必须转到“控制器/核心”文件夹。php，您必须更改函数get\\u recent\\u posts（）。您必须添加此代码才能删除不需要的类别：

public function get_recent_posts() {
global $json_api;

// get all the categories from the database
        $cats = get_categories(); 

            // loop through the categries
            foreach ($cats as $cat) {
                // setup the cateogory ID
                $cat_id = $cat->term_id;

                // create a custom wordpress query
                query_posts("cat=-434,-22837,-13571,-1,-18,-17385");
                // start the wordpress loop!

                while (have_posts()) {
                $posts = $json_api->introspector->get_posts();  
                return $this->posts_result($posts);
                }
           } 

  }